Dear Cristian and SSC,
I would recommend to use the platform independent Broadcast WAVE file format with correct file/type extensions:
This is used for "Split-Files" or so Deinterleaved Broadcast WAVE files.
OSX assosciates the .R suffix with BBedit because .R is offen used for textfiles.
Windows might associate .L .R with a totaly differnt application.
I remember from back in the MacOS 7-9 days that .L - .R "Split files" extensions where mainly used for SD2 Stereo split files in Sounddesigner, ProTools, Soundminer, Digital Performer for example.
You might change your batch to export in WAVE and use the above naming scheme with the .wav suffix if you want to be platform independent.
Of course you can use AIF and WAV for Surround Multichannel audio too.
This would look like this (.AIF example from the Kyma X folder):
All the best from Berlin